chore(lmxproxy): switch health probe tag to DevAppEngine.Scheduler.ScanTime, remove temp prompts
AppEngine built-in tag is always present and constantly updating (~1s), making it a more reliable probe than a user-deployed TestChildObject tag. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Joseph Doherty
@@ -1,119 +0,0 @@
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# LmxProxy v2 — Fix Failing Write Integration Tests
|
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|
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Run this prompt with Claude Code from the `lmxproxy/` directory.
|
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## Prompt
|
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|
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You are debugging and fixing 2 failing integration tests for the LmxProxy v2 gRPC proxy service. The tests are `WriteAndReadBack` and `WriteBatchAndWait` in the integration test project.
|
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### Context
|
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|
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Read these documents before starting:
|
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||||||
|
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1. `CLAUDE.md` — project-level instructions and architecture
|
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2. `docs/deviations.md` — deviation #7 describes the failure (OnWriteComplete COM callback not firing)
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3. `mxaccess_documentation.md` — the official MxAccess Toolkit reference. Search for "OnWriteComplete", "Write() method", and "AdviseSupervisory" sections.
|
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|
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Read these source files:
|
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|
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4. `src/ZB.MOM.WW.LmxProxy.Host/MxAccess/MxAccessClient.ReadWrite.cs` — current v2 write implementation
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5. `src/ZB.MOM.WW.LmxProxy.Host/MxAccess/MxAccessClient.EventHandlers.cs` — OnWriteComplete callback handler
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6. `src/ZB.MOM.WW.LmxProxy.Host/MxAccess/MxAccessClient.Connection.cs` — COM event wiring (`_lmxProxy.OnWriteComplete += OnWriteComplete`)
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7. `src-reference/ZB.MOM.WW.LmxProxy.Host/Implementation/MxAccessClient.ReadWrite.cs` — v1 write implementation (for comparison)
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8. `src-reference/ZB.MOM.WW.LmxProxy.Host/Implementation/MxAccessClient.EventHandlers.cs` — v1 OnWriteComplete handler
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9. `tests/ZB.MOM.WW.LmxProxy.Client.IntegrationTests/WriteTests.cs` — failing WriteAndReadBack test
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10. `tests/ZB.MOM.WW.LmxProxy.Client.IntegrationTests/WriteBatchAndWaitTests.cs` — failing WriteBatchAndWait test
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### Problem Statement
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The `OnWriteComplete` COM callback from MxAccess never fires within the write timeout (default 5s). The write operation follows this flow:
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1. `AddItem()` — registers the tag with MxAccess
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2. `AdviseSupervisory()` — establishes a supervisory connection for the tag
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3. Store a `TaskCompletionSource<bool>` in `_pendingWrites[itemHandle]`
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4. `Write()` — sends the write to MxAccess
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5. Wait for `OnWriteComplete` callback to resolve the TCS — **this never fires, causing a timeout**
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The v1 code used the same pattern and presumably worked, so the issue is either:
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- (a) MxAccess completes the write synchronously and never fires `OnWriteComplete` for simple (non-secured, non-verified) writes. The documentation says: "The LMXProxyInterface triggers an event for OnWriteComplete when your program calls the Write() or WriteSecured() function." However, this may not be true in all configurations or for all attribute types.
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- (b) The COM event subscription wiring (`_lmxProxy.OnWriteComplete += OnWriteComplete`) is correct syntactically but the callback doesn't fire because the thread that called `Write()` (a thread pool thread via `Task.Run`) isn't pumping COM messages. Note: STA threading was abandoned (see deviation #2 in `docs/deviations.md`) because it caused other issues with `OnDataChange` callbacks.
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- (c) There's a difference in how v1 vs v2 initializes or interacts with the COM object that affects event delivery.
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### Investigation Steps
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These steps require SSH access to windev where the v2 Host is deployed.
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**Step 1: Check if the write actually succeeds despite no callback.**
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The `WriteAndReadBack` test writes a value and then reads it back. The test fails because `WriteAsync` throws a `TimeoutException` (OnWriteComplete never fires). But the write itself may have succeeded at the MxAccess level.
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|
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SSH to windev (`ssh windev`) and:
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- Check the v2 Host service logs in `C:\publish-v2\logs\` for any write-related log entries
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- Look for "Write failed", "WriteComplete", or "timeout" messages
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**Step 2: Add a fire-and-forget write mode.**
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If the write succeeds at the MxAccess level but `OnWriteComplete` never fires, the simplest fix is to bypass the callback wait. Modify `MxAccessClient.ReadWrite.cs`:
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- After calling `_lmxProxy.Write()`, immediately resolve the TCS with success instead of waiting for the callback
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- Keep the `OnWriteComplete` handler wired up — if it does fire, it can log the result for diagnostics but shouldn't block the write path
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- Add a configuration option `WriteConfirmationMode` with values `FireAndForget` (default) and `WaitForCallback`, so the behavior can be switched if needed
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The rationale: the MxAccess documentation's sample application (Chapter 6) uses `OnWriteComplete` to detect whether a *secured* or *verified* write is needed, then retries with `WriteSecured()`. For simple supervisory writes (which is what LmxProxy does), the Write() call itself is the confirmation — if it doesn't throw, the write was accepted.
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**Step 3: Implement the fix.**
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In `MxAccessClient.ReadWrite.cs`, modify `SetupWriteOperationAsync`:
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```
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// After _lmxProxy.Write():
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// Immediately complete the write — OnWriteComplete may not fire for supervisory writes
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tcs.TrySetResult(true);
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```
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Remove the `_pendingWrites[itemHandle] = tcs` tracking since it's no longer needed for the default path. Keep `OnWriteComplete` wired for logging/diagnostics.
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Clean up `WaitForWriteCompletionAsync` — in fire-and-forget mode, the TCS is already completed so the await returns immediately. The cleanup (UnAdvise + RemoveItem) should still happen.
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**Step 4: Consider an alternative approach — poll-based write confirmation.**
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|
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If fire-and-forget is too loose (we want to confirm the write took effect), consider a poll-based approach similar to `WriteBatchAndWaitAsync`: after writing, read the tag back and compare. This is more reliable than depending on a COM callback. However, this adds latency and may not be needed — the `WriteAndReadBack` test already does a read-back verification.
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**Step 5: Build and deploy.**
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After making changes:
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|
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```bash
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ssh windev "cd C:\source\lmxproxy && git pull && dotnet build src\ZB.MOM.WW.LmxProxy.Host -c Release -r win-x86 --no-self-contained -o C:\publish-v2"
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```
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Restart the v2 service:
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```bash
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ssh windev "net stop LmxProxyV2 && net start LmxProxyV2"
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```
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**Step 6: Run the integration tests.**
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From the Mac:
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```bash
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cd tests/ZB.MOM.WW.LmxProxy.Client.IntegrationTests
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dotnet test --filter "WriteAndReadBack|WriteBatchAndWait" -v n
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```
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Both tests should pass. If they do, run the full integration test suite:
|
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||||||
```bash
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dotnet test -v n
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```
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|
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**Step 7: Update deviations document.**
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|
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||||||
If the fix works, update `docs/deviations.md` deviation #7 to reflect the resolution. Change the status from pending to resolved and document what was done.
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|
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### Guardrails
|
|
||||||
|
|
||||||
1. **Do not reintroduce STA threading.** The MTA/Task.Run approach works for `OnDataChange` callbacks and subscriptions. Do not change the threading model.
|
|
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2. **Do not modify the integration tests** unless they have a genuine bug (e.g., wrong assertion, wrong tag name). The tests define the expected behavior — fix the implementation to match.
|
|
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3. **Do not modify the proto file or gRPC contracts.** This is a Host-side implementation fix only.
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4. **Keep the OnWriteComplete handler wired.** Even if we don't wait on it, the callback provides diagnostic information (security errors, verified write requirements) that should be logged.
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||||||
5. **Commit with message:** `fix(lmxproxy): resolve write timeout — bypass OnWriteComplete callback for supervisory writes`
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@@ -1,98 +0,0 @@
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# LmxProxy v2 Rebuild — Execution Prompt
|
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||||||
|
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||||||
Run this prompt with Claude Code from the `lmxproxy/` directory to execute all 7 phases of the rebuild autonomously.
|
|
||||||
|
|
||||||
## Prompt
|
|
||||||
|
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||||||
You are executing a pre-approved implementation plan for rebuilding the LmxProxy gRPC proxy service. All design decisions have been made and documented. You do NOT need to ask for approval — execute each phase completely, then move to the next.
|
|
||||||
|
|
||||||
### Context
|
|
||||||
|
|
||||||
Read these documents in order before starting:
|
|
||||||
|
|
||||||
1. `docs/plans/2026-03-21-lmxproxy-v2-rebuild-design.md` — the approved design
|
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||||||
2. `CLAUDE.md` — project-level instructions
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||||||
3. `docs/requirements/HighLevelReqs.md` — high-level requirements
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|
||||||
4. `docs/requirements/Component-*.md` — all component requirements (10 files)
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||||||
5. `docs/lmxproxy_updates.md` — authoritative v2 protocol specification
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|
||||||
|
|
||||||
### Execution Order
|
|
||||||
|
|
||||||
Execute phases in this exact order. Each phase has a detailed plan in `docs/plans/`:
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||||||
|
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||||||
1. **Phase 1**: `docs/plans/phase-1-protocol-domain-types.md`
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|
||||||
2. **Phase 2**: `docs/plans/phase-2-host-core.md`
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||||||
3. **Phase 3**: `docs/plans/phase-3-host-grpc-security-config.md`
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|
||||||
4. **Phase 4**: `docs/plans/phase-4-host-health-metrics.md`
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||||||
5. **Phase 5**: `docs/plans/phase-5-client-core.md`
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|
||||||
6. **Phase 6**: `docs/plans/phase-6-client-extras.md`
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|
||||||
7. **Phase 7**: `docs/plans/phase-7-integration-deployment.md`
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|
|
||||||
### How to Execute Each Phase
|
|
||||||
|
|
||||||
For each phase:
|
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||||||
|
|
||||||
1. Read the phase plan document completely before writing any code.
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|
||||||
2. Read any referenced requirements documents for that phase.
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|
||||||
3. Execute each step in the plan in order.
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|
||||||
4. After all steps, run `dotnet build` and `dotnet test` to verify.
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|
||||||
5. If build or tests fail, fix the issues before proceeding.
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|
||||||
6. Commit the phase with message: `feat(lmxproxy): phase N — <description>`
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|
||||||
7. Push to remote: `git push`
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|
||||||
8. Move to the next phase.
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|
||||||
|
|
||||||
### Guardrails (MUST follow)
|
|
||||||
|
|
||||||
1. **Proto is the source of truth** — any wire format question is resolved by reading `src/ZB.MOM.WW.LmxProxy.Host/Grpc/Protos/scada.proto`, not the code-first contracts.
|
|
||||||
2. **No v1 code in the new build** — the `src-reference/` directory is for reading only. Do not copy-paste and modify; write fresh code guided by the plan.
|
|
||||||
3. **Cross-stack tests in Phase 1** — Host proto serialize to Client code-first deserialize (and vice versa) must pass before any business logic.
|
|
||||||
4. **COM calls only on STA dispatch thread** — no `Task.Run` for COM operations. All go through the `StaDispatchThread` dispatch queue.
|
|
||||||
5. **status_code is canonical for quality** — `symbolic_name` is always derived from lookup, never independently set.
|
|
||||||
6. **Unit tests before integration** — every phase includes unit tests. Integration tests are Phase 7 only.
|
|
||||||
7. **Each phase must compile and pass tests** before the next phase begins. Do not skip failing tests.
|
|
||||||
8. **No string serialization heuristics** — v2 uses native TypedValue. No `double.TryParse` or `bool.TryParse` on values.
|
|
||||||
9. **Do not modify requirements or design docs** — if you find a conflict, follow the design doc's resolution (section 11).
|
|
||||||
10. **Do not ask for user approval** — all decisions are pre-approved in the design document.
|
|
||||||
|
|
||||||
### Error Recovery
|
|
||||||
|
|
||||||
- If a build fails, read the error messages carefully, fix the code, and rebuild.
|
|
||||||
- If a test fails, fix the implementation (not the test) unless the test has a clear bug.
|
|
||||||
- If a step in the plan is ambiguous, consult the requirements document for that component.
|
|
||||||
- If the requirements are ambiguous, consult the design document's resolution table (section 11).
|
|
||||||
- If you cannot resolve an issue after 3 attempts, skip that step, leave a `// TODO: <description>` comment, and continue.
|
|
||||||
|
|
||||||
### Phase 7 Special Instructions
|
|
||||||
|
|
||||||
Phase 7 requires SSH access to windev (10.100.0.48). See `windev.md` in the repo root for connection details:
|
|
||||||
- SSH: `ssh windev` (passwordless)
|
|
||||||
- Default shell: cmd.exe, use `powershell -Command` for PowerShell
|
|
||||||
- Git and .NET SDK 10 are installed
|
|
||||||
- The existing v1 LmxProxy service is at `C:\publish\` on port 50051
|
|
||||||
|
|
||||||
For Veeam backups, SSH to the Veeam server:
|
|
||||||
- SSH: `ssh dohertj2@10.100.0.30` (passwordless)
|
|
||||||
- Use `Add-PSSnapin VeeamPSSnapin` for Veeam PowerShell
|
|
||||||
|
|
||||||
### Commit Messages
|
|
||||||
|
|
||||||
Use this format for each phase commit:
|
|
||||||
|
|
||||||
- Phase 1: `feat(lmxproxy): phase 1 — v2 protocol types and domain model`
|
|
||||||
- Phase 2: `feat(lmxproxy): phase 2 — host core (MxAccessClient, SessionManager, SubscriptionManager)`
|
|
||||||
- Phase 3: `feat(lmxproxy): phase 3 — host gRPC server, security, configuration, service hosting`
|
|
||||||
- Phase 4: `feat(lmxproxy): phase 4 — host health monitoring, metrics, status web server`
|
|
||||||
- Phase 5: `feat(lmxproxy): phase 5 — client core (ILmxProxyClient, connection, read/write/subscribe)`
|
|
||||||
- Phase 6: `feat(lmxproxy): phase 6 — client extras (builder, factory, DI, streaming extensions)`
|
|
||||||
- Phase 7: `feat(lmxproxy): phase 7 — integration tests, deployment to windev, v1 cutover`
|
|
||||||
|
|
||||||
### After All Phases
|
|
||||||
|
|
||||||
When all 7 phases are complete:
|
|
||||||
|
|
||||||
1. Run `dotnet build ZB.MOM.WW.LmxProxy.slnx` to verify the full solution builds.
|
|
||||||
2. Run `dotnet test` to verify all unit tests pass.
|
|
||||||
3. Verify the integration tests passed in Phase 7.
|
|
||||||
4. Create a final commit if any cleanup was needed.
|
|
||||||
5. Push all changes.
|
|
||||||
6. Report: total files created, total tests, build status, integration test results.
|
|
||||||
@@ -1,95 +0,0 @@
|
|||||||
# LmxProxy Requirements Documentation Prompt
|
|
||||||
|
|
||||||
Use this prompt with Claude Code to generate the requirements documentation for the LmxProxy project. Run from the `lmxproxy/` directory.
|
|
||||||
|
|
||||||
## Prompt
|
|
||||||
|
|
||||||
Create requirements documentation for the LmxProxy project in `docs/requirements/`. Follow the same structure used in the ScadaLink project (`docs/requirements/` in the parent repo) — a high-level requirements doc and per-component breakout documents.
|
|
||||||
|
|
||||||
### Context
|
|
||||||
|
|
||||||
LmxProxy is a gRPC proxy service that bridges SCADA clients to industrial automation systems (primarily AVEVA/Wonderware System Platform via ArchestrA.MXAccess). It consists of two projects:
|
|
||||||
|
|
||||||
1. **ZB.MOM.WW.LmxProxy.Host** — A .NET Framework 4.8 Windows service (Topshelf) that runs on the same machine as System Platform. It connects to MXAccess (COM interop, x86) and exposes a gRPC server for remote SCADA operations (read, write, subscribe, batch operations). It handles session management, API key authentication, TLS, health checks, performance metrics, and subscription management.
|
|
||||||
|
|
||||||
2. **ZB.MOM.WW.LmxProxy.Client** — A .NET 10 class library providing a typed gRPC client for consuming the LmxProxy service. It uses protobuf-net.Grpc (code-first, no .proto files). It includes connection management, retry policies, TLS support, streaming extensions, DI integration, and a builder pattern for configuration.
|
|
||||||
|
|
||||||
### What to Generate
|
|
||||||
|
|
||||||
**1. `docs/requirements/HighLevelReqs.md`** — High-level requirements covering:
|
|
||||||
- System purpose and architecture (proxy pattern, why it exists)
|
|
||||||
- Deployment model (runs on System Platform machine, clients connect remotely)
|
|
||||||
- Communication protocol (gRPC, HTTP/2, code-first and proto-based)
|
|
||||||
- Session lifecycle (connect, session ID, disconnect, no idle timeout)
|
|
||||||
- Authentication model (API key via metadata header, configurable enforcement)
|
|
||||||
- TLS/security model (optional TLS, mutual TLS support, certificate validation)
|
|
||||||
- Data model (VTQ — Value/Timestamp/Quality, OPC-style quality codes)
|
|
||||||
- Operations (read, read batch, write, write batch, write-and-wait, subscribe)
|
|
||||||
- Subscription model (server-streaming, tag-based, sampling interval)
|
|
||||||
- Health monitoring and metrics
|
|
||||||
- Service hosting (Topshelf Windows service, service recovery)
|
|
||||||
- Configuration (appsettings.json sections)
|
|
||||||
- Scale considerations
|
|
||||||
- Protocol versioning (v1 string-based, v2 OPC UA-aligned typed values)
|
|
||||||
|
|
||||||
**2. Component documents** — One `Component-<Name>.md` for each logical component:
|
|
||||||
|
|
||||||
- **Component-GrpcServer.md** — The gRPC service implementation (ScadaGrpcService). Session validation, request routing to MxAccessClient, subscription lifecycle, error handling, proto-based serialization.
|
|
||||||
|
|
||||||
- **Component-MxAccessClient.md** — The MXAccess COM interop wrapper. Connection lifecycle (Become/Stash-like state machine), tag registration, read/write operations, subscription via advise callbacks, event handling, x86/COM threading constraints. This is the core component.
|
|
||||||
|
|
||||||
- **Component-SessionManager.md** — Client session tracking, session creation/destruction, session-to-client mapping, concurrent session limits.
|
|
||||||
|
|
||||||
- **Component-Security.md** — API key authentication (ApiKeyService, ApiKeyInterceptor), key file management, role-based permissions (ReadOnly/ReadWrite), TLS certificate management.
|
|
||||||
|
|
||||||
- **Component-SubscriptionManager.md** — Tag subscription lifecycle, channel-based update delivery, sampling intervals, backpressure (channel full modes), subscription cleanup on disconnect.
|
|
||||||
|
|
||||||
- **Component-Configuration.md** — appsettings.json structure, configuration validation, TLS configuration, service recovery configuration, connection timeouts, retry policies.
|
|
||||||
|
|
||||||
- **Component-HealthAndMetrics.md** — Health check service (test tag reads, stale data detection), performance metrics (operation counts, latencies, percentiles), status web server (HTTP status endpoint).
|
|
||||||
|
|
||||||
- **Component-ServiceHost.md** — Topshelf service hosting, Program.cs entry point, Serilog logging setup, service install/uninstall, service recovery (Windows SCM restart policies).
|
|
||||||
|
|
||||||
- **Component-Client.md** — The LmxProxyClient library. Builder pattern, connection management, retry with Polly, keep-alive pings, streaming extensions, DI registration (ServiceCollectionExtensions), factory pattern, TLS configuration.
|
|
||||||
|
|
||||||
- **Component-Protocol.md** — The gRPC protocol specification. Proto definition, code-first contracts (IScadaService), message schemas, VTQ format, quality codes, v1 vs v2 differences.
|
|
||||||
|
|
||||||
### Document Structure (per component)
|
|
||||||
|
|
||||||
Each component doc must follow this structure exactly:
|
|
||||||
```
|
|
||||||
# Component: <Name>
|
|
||||||
|
|
||||||
## Purpose
|
|
||||||
<1-2 sentence description>
|
|
||||||
|
|
||||||
## Location
|
|
||||||
<Which project(s) and key files>
|
|
||||||
|
|
||||||
## Responsibilities
|
|
||||||
<Bulleted list of what this component does>
|
|
||||||
|
|
||||||
## <Detail sections>
|
|
||||||
<Numbered or named sections with specific design details>
|
|
||||||
|
|
||||||
## Dependencies
|
|
||||||
<What this component depends on>
|
|
||||||
|
|
||||||
## Interactions
|
|
||||||
<How this component interacts with others>
|
|
||||||
```
|
|
||||||
|
|
||||||
### Sources
|
|
||||||
|
|
||||||
Derive requirements from:
|
|
||||||
- The source code in `src/ZB.MOM.WW.LmxProxy.Host/` and `src/ZB.MOM.WW.LmxProxy.Client/`
|
|
||||||
- The protocol docs in `docs/lmxproxy_protocol.md` and `docs/lmxproxy_updates.md`
|
|
||||||
- The appsettings.json configuration files
|
|
||||||
|
|
||||||
### Rules
|
|
||||||
|
|
||||||
- Write requirements as design decisions, not aspirational statements. Describe what the system **does**, not what it **should** do.
|
|
||||||
- Include specific values from configuration (ports, timeouts, intervals, limits).
|
|
||||||
- Cross-reference between documents using component names.
|
|
||||||
- Keep the high-level doc focused on system-wide concerns; push implementation details to component docs.
|
|
||||||
- Do not invent features not present in the source code.
|
|
||||||
@@ -31,8 +31,8 @@ namespace ZB.MOM.WW.LmxProxy.Host.Configuration
|
|||||||
/// <summary>Health check / probe configuration.</summary>
|
/// <summary>Health check / probe configuration.</summary>
|
||||||
public class HealthCheckConfiguration
|
public class HealthCheckConfiguration
|
||||||
{
|
{
|
||||||
/// <summary>Tag address to probe for connection liveness. Default: TestChildObject.TestBool.</summary>
|
/// <summary>Tag address to probe for connection liveness. Default: DevAppEngine.Scheduler.ScanTime.</summary>
|
||||||
public string TestTagAddress { get; set; } = "TestChildObject.TestBool";
|
public string TestTagAddress { get; set; } = "DevAppEngine.Scheduler.ScanTime";
|
||||||
|
|
||||||
/// <summary>Probe timeout in milliseconds. Default: 5000.</summary>
|
/// <summary>Probe timeout in milliseconds. Default: 5000.</summary>
|
||||||
public int ProbeTimeoutMs { get; set; } = 5000;
|
public int ProbeTimeoutMs { get; set; } = 5000;
|
||||||
|
|||||||
@@ -20,7 +20,7 @@ namespace ZB.MOM.WW.LmxProxy.Host.Health
|
|||||||
|
|
||||||
public DetailedHealthCheckService(
|
public DetailedHealthCheckService(
|
||||||
IScadaClient scadaClient,
|
IScadaClient scadaClient,
|
||||||
string testTagAddress = "TestChildObject.TestBool")
|
string testTagAddress = "DevAppEngine.Scheduler.ScanTime")
|
||||||
{
|
{
|
||||||
_scadaClient = scadaClient;
|
_scadaClient = scadaClient;
|
||||||
_testTagAddress = testTagAddress;
|
_testTagAddress = testTagAddress;
|
||||||
|
|||||||
@@ -33,7 +33,7 @@
|
|||||||
},
|
},
|
||||||
|
|
||||||
"HealthCheck": {
|
"HealthCheck": {
|
||||||
"TestTagAddress": "TestChildObject.TestBool",
|
"TestTagAddress": "DevAppEngine.Scheduler.ScanTime",
|
||||||
"ProbeTimeoutMs": 5000,
|
"ProbeTimeoutMs": 5000,
|
||||||
"MaxConsecutiveTransportFailures": 3,
|
"MaxConsecutiveTransportFailures": 3,
|
||||||
"DegradedProbeIntervalMs": 30000
|
"DegradedProbeIntervalMs": 30000
|
||||||
|
|||||||
Reference in New Issue
Block a user